Self-healing properties of TiO2 particle–polymer composite coatings for protection of aluminum alloys against corrosion in seawater

✍ Scribed by A. Yabuki; W. Urushihara; J. Kinugasa; K. Sugano

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: German
• Weight: 293 KB
• Volume: 62
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.201005756

✦ Synopsis

Abstract

TiO~2~ particle–polymer composite coatings were applied to the surface of a 5083 aluminum alloy. After using a knife to create an artificial defect, polarization resistance was monitored in artificial seawater at a temperature of 30 °C. The polarization resistance of the specimen coated with the composite polymer containing 3 vol% TiO~2~ particles increased significantly over time, suggesting that the composite coating had self‐healing properties. A carbon‐containing 2‐µm thick film was found on the coated aluminum substrate at the site of the artificial defect. The formation of the film was related to the dissolution of bisphenol A (BPA), which is a chemical precursor of the polymer coating that behaved as an inhibiting agent.